Starter Does Not Operate or Does Not Turn Engine Over
  1. Engine OFF/RUN switch in OFF position.
  2. Ignition switch not in IGNITION position.
  3. Discharged battery or loose or corroded connections (solenoid chatters).
  4. Clutch lever not squeezed against handlebar and front or rear brake applied or transmission not in neutral.
  5. Main fuse not in place.
Engine Turns Over but Does Not Start
  1. Fuel tank empty.
  2. Fuel filter is clogged.
  3. Discharged battery or loose or damaged battery terminal connections.
  4. Fouled spark plugs.
  5. Spark plug cable connections loose or in bad condition and shorting.
  6. Loose or corroded wire or cable connections at coil or battery.
  7. Fuel pump is inoperative.
  8. Main fuse not in place.
Starts Hard
  1. Spark plugs in bad condition, have improper gap or are partially fouled.
  2. Spark plug cables in bad condition and leaking.
  3. Battery nearly discharged.
  4. Damaged or loose wire or cable connections at one of the battery terminals or at ignition coil.
  5. Engine oil too heavy (cold-weather operation).
  6. Water or dirt in fuel system.
  7. Fuel pump is inoperative.
Starts but Runs Irregularly or Misses
  1. Spark plugs in bad condition or partially fouled.
  2. Spark plug cables in bad condition and leaking.
  3. Spark plug gap too close or too wide.
  4. Battery nearly discharged.
  5. Damaged wire or loose wire connection at ignition coil, battery or ECM connector.
  6. Intermittent short circuit due to damaged wire insulation.
  7. Water or dirt in fuel system.
  8. Fuel vent system plugged. See dealer.
  9. One or more injectors fouled.
A Spark Plug Fouls Repeatedly
  1. Fuel mixture too rich.
  2. Incorrect spark plug.
Pre-ignition or Detonation (Knocks or Pings)
  1. Incorrect fuel.
  2. Incorrect spark plug for the kind of service.
Overheats
  1. Insufficient oil supply or oil not circulating.
  2. Heavy carbon deposit from lugging engine. See dealer.
  3. Insufficient air flow over cylinder heads during extended periods of idling or parade duty.
Excessive Vibration
  1. Rear fork pivot shaft nuts loose. See dealer.
  2. Front engine mounting bolts loose. See dealer.
  3. Engine to transmission mounting bolts loose. See dealer.
  4. Damaged frame. See dealer.
  5. Front chain or links tight as a result of insufficient lubrication or belt badly worn.
  6. Wheels and/or tires damaged. See dealer.
  7. Vehicle not properly aligned. See dealer.
  8. Steering head damper worn or damaged. See dealer.
  9. Panhard rod fasteners loose. See dealer.
Engine Oil Not Circulating (Oil Pressure Lamp Lit)
  1. Insufficient or diluted oil supply.
  2. Oil feed clogged with ice and sludge in freezing weather.
  3. Grounded oil signal switch wire or faulty signal switch. See dealer.
  4. Damaged or improperly installed check valve. See dealer.
  5. Oil pump problem. See dealer.